Karen Khachanov is into the US Open semifinals after Alexander Blockx retired in their quarterfinal at Arthur Ashe Stadium with the score at 6-2, 7-5, 3-2 in favor of the Russian. The match ended under the official status “Retired,” and there was no need for a tiebreak across the three sets in progress. Khachanov served first, set the early tone, and steadily built a lead through superior serving efficiency and constant pressure on return. For full point-by-point details and the complete box score, check the Sofascore match page here.

Khachanov in control before the halt

Across the completed portion of the match, Khachanov led the total points 80 to 60 and the total games 16 to 9. He also produced more winners, 23 to 17, while keeping his overall errors lower than Blockx, 18 to 28. The return column leaned heavily his way, with 29 receiver points won to Blockx’s 15, which explains the 4-0 edge in breaks. He never faced a sustained wobble on serve and saved the only two break points against him, finishing with a perfect 2/2 in break points saved. On the other side, Blockx saved just two of six break points faced, which left him constantly playing catch-up.

There were momentum spells too, and almost all of them favored Khachanov. He posted a match-best run of 7 points in a row and matched or bettered Blockx’s streaks in every set. The scoreboard reflects a clean start at 6-2, then a tighter second set at 7-5, followed by a 3-2 lead in the third when the match stopped. The numbers point to a performance that was strong, measured, and repeatable rather than one built on a single hot patch.

Serve numbers set the tone on Arthur Ashe

Blockx actually delivered more aces, 8 to 6, but Khachanov’s serve was far more efficient in the rallies that followed. Khachanov won a massive 89% of points behind his first serve, taking 32 of 36, and backed it up with 70% behind his second serve with 19 of 27. Blockx held a decent first-serve win rate at 71% with 29 of 41, but his second-serve points won dropped to 48% with 16 of 33. The double-fault column also tilted toward Khachanov, who kept it to 2, while Blockx finished with 4.

First-serve accuracy was near level, 57% for Khachanov against 55% for Blockx, yet the outcomes could not have been more different. Khachanov’s service points totaled 51 compared to Blockx’s 45, and the Russian conceded no breaks. He played 12 service games and won all 12, while Blockx needed 13 service games to collect 7 holds. In short, Khachanov made his first delivery count and protected his second delivery better, which is often the winning recipe on hard courts at Flushing Meadows.

Return pressure and the break-point story

Khachanov’s return numbers did the heavy lifting in key moments. He won 29% of first-serve return points, going 12 of 41, and a very healthy 51% against the second serve, taking 17 of 33. Blockx could not match that pressure. He managed just 11% of first-serve return points, with 4 of 36, and 29% on second-serve return, with 8 of 27. That gap on second serves explains the 4 breaks for Khachanov and none for Blockx.

Break-point conversion confirmed the same pattern. Khachanov went 4 on the break scoreboard and saved both chances against him for a spotless day on serve. Blockx created six chances but could convert none and saved only two of the six he faced. Over time, that differential forced Blockx to hit closer to the lines and accept more risk, which shows up in his higher error count. On a big court like Arthur Ashe, those little margins turn into quick scoreboard pressure.

Winners, errors and the baseline pattern

From the back of the court, Khachanov’s balance stood out. He finished with 23 total winners to 17 for Blockx, with 11 forehand winners and 6 off the backhand. Groundstroke winners were a decisive 15 to 7 for Khachanov, adding to the sense that he controlled neutral exchanges and found depth when needed. At net, they were even at 2 volley winners each, which underlined that the match was largely decided from the baseline.

The error ledger gave Khachanov further breathing room. Blockx totaled 28 errors to Khachanov’s 18 and also led the unforced category, 26 to 21. The Belgian’s forehand misfired most often, recording 17 unforced errors against Khachanov’s 10. Khachanov’s backhand had 9 unforced errors to Blockx’s 5, but the Russian offset that with superior backhand winners, 6 to 1. Put together, Khachanov’s baseline package produced more clean hits with fewer loose swings.

Set by set: how the quarterfinal unfolded

The first set moved quickly once Khachanov found rhythm on return. He won 14 receiver points to 5, including 9 of 12 against the second serve, and converted both break chances to take it 6-2. Behind his own delivery he was nearly perfect, winning 11 of 12 first-serve points and 7 of 11 behind his second serve. He also saved both break points he faced, closing the door early on any momentum for Blockx.

The second set was closer, but the trends held. Khachanov won 25 service points to 21 and split receiver points 7 to 7 with Blockx, yet took the only break of the set for 7-5. He did not face a break point in the set, while Blockx faced one and could not save it. The third set began with a short burst of dominance from the Russian, including 100% first-serve points won in that segment and another break to lead 3-2 before the match ended under retirement. No tiebreaks were played in any set.

With the statistics laid out, the story reads clearly. Khachanov combined elite first-serve efficiency with reliable second-serve protection and applied steady return pressure on both Blockx’s serves. Blockx produced patches of big serving, especially with aces, but too many second-serve exchanges slipped away. When the third set stopped at 3-2, the overall balance had long tilted toward Khachanov.

If you want to revisit every segment or share the numbers, the full breakdown is on Sofascore. You can browse the live momentum swings and detailed stats on the official match page.